Question:
Which of the following is a basic oxide? ________.
Which of the following is a basic oxide? ________.
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Basicity $\propto \frac{1}{\text{Oxidation State}}$.
Updated On: Jun 26, 2026
- CrO
- $CrO_{3}$
- $Mn_{2}O_{7}$
- $Cr_{2}O_{3}$
- $V_{2}O_{5}$
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The Correct Option is A
Solution and Explanation
Step 1: Concept
For transition metal oxides, the basic character decreases as the oxidation state of the metal increases.
Step 2: Meaning
Low oxidation state = Basic; Intermediate = Amphoteric; High = Acidic.
Step 3: Analysis
In $CrO$, the oxidation state of $Cr$ is $+2$ (lowest). In $Cr_2O_3$ ($+3$) is amphoteric; $CrO_3$ ($+6$) and $Mn_2O_7$ ($+7$) are acidic.
Step 4: Conclusion
$CrO$ is the basic oxide. Final Answer: (A)
For transition metal oxides, the basic character decreases as the oxidation state of the metal increases.
Step 2: Meaning
Low oxidation state = Basic; Intermediate = Amphoteric; High = Acidic.
Step 3: Analysis
In $CrO$, the oxidation state of $Cr$ is $+2$ (lowest). In $Cr_2O_3$ ($+3$) is amphoteric; $CrO_3$ ($+6$) and $Mn_2O_7$ ($+7$) are acidic.
Step 4: Conclusion
$CrO$ is the basic oxide. Final Answer: (A)
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